大约有 40,000 项符合查询结果（耗时：0.0689秒） [XML]
ActiveRecord.find(array_of_ids), preserving order
...nd(ids, :order => "field(id, #{ids.join(',')})")
=> [100, 1, 6]
For new Version
>> WordDocument.where(id: ids).order("field(id, #{ids.join ','})")
Update:
This will be removed in Rails 6.1 Rails source code
sha...
Merge/flatten an array of arrays
...
Here's a short function that uses some of the newer JavaScript array methods to flatten an n-dimensional array.
function flatten(arr) {
return arr.reduce(function (flat, toFlatten) {
return flat.concat(Array.isArray(toFlatten) ? flatten(toFlatten) : toFlatten);
...
Is it possible to start activity through adb shell? [duplicate]
...package>
– Doge
Sep 28 '16 at 20:51
2
@ChristopherGalpin No need to pull the APKs, adb shell d...
JavaScript closure inside loops – simple practical example
...e outside of the function.
ES6 solution: let
ECMAScript 6 (ES6) introduces new let and const keywords that are scoped differently than var-based variables. For example, in a loop with a let-based index, each iteration through the loop will have a new variable i with loop scope, so your code would wo...
When should we use intern method of String on String literals
...ng from the String pool if the String is found in String pool, otherwise a new string object will be added in String pool and the reference of this String is returned.
...
How do you save/store objects in SharedPreferences on Android?
...es mPrefs = getPreferences(MODE_PRIVATE);
To save:
MyObject myObject = new MyObject;
//set variables of 'myObject', etc.
Editor prefsEditor = mPrefs.edit();
Gson gson = new Gson();
String json = gson.toJson(myObject);
prefsEditor.putString("MyObject", json);
prefsEditor.commit();
To retrieve:...
Android. Fragment getActivity() sometimes returns null
...dicator = (TitlePageIndicator) findViewById(R.id.indicator);
adapter = new TabsAdapter(getSupportFragmentManager(), false);
if (savedInstanceState == null){
adapter.addFragment(new FirstFragment());
adapter.addFragment(new SecondFragment());
}else{
Integer c...
Deleting rows with MySQL LEFT JOIN
...unction () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f2763206%2fdeleting-rows-with-mysql-left-join%23new-answer', 'question_page');
}
);
...
How to retrieve GET parameters from javascript? [duplicate]
...
You should use URL and URLSearchParams native functions:
let url = new URL("https://www.google.com/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8&q=mdn%20query%20string")
let params = new URLSearchParams(url.search);
let sourceid = params.get('sourceid') // 'chrome-ins...
Python module os.chmod(file, 664) does not change the permission to rw-rw-r— but -w--wx----
...sing Python module os, when I tried to change the permission of a file, I did not get the expected result. For example, I intended to change the permission to rw-rw-r--,
...